Using UNC to store Blogs

I have the following setup, 4 web servers in a cluster, however not in a farm, therefore I need to take one web server offline in turn and manually upload production web sites to each web server when changes are made.

The issue I have using BlogEngine, though we use SQL which works fine, we find different servers have different blogs created in the App_Data\blogs directory depending on which server the users was logged onto when the blog was created.

Is there a way to change the XML directory to use a single shared directory as you can for the UNC uploading storage point.